Anyone have a random spurt of weight gain?

Over the past few months I had been gaining nearly a pound a month, at my last checkup a few days ago (31 weeks and a few days) i found i had gained an entire 4 pounds in just a bit less than half a month. I also failed my first glucose test, got sick with my second (3 hour), doing the last try for the 3 hour this week. Could the random rapid weight gain be from gestational diabetes do you think? Opinions? I go to a clinic so they just put everything to a computer and don't really keep track of anything well, I see about three different doctors (all different from my last appointments) every time I go there and they just put all the information into a computer but don't really compare it. I'll bring it up at my next appointment though. Just wanted opinions.